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The Top Worldwide Media Planning & Media Buying Agencies

In simple terms, media agencies are the companies responsible for overseeing the delivery of advertising campaigns by deciding where ads will appear (a process known as media planning) and then negotiating over rates with mediaowners such as broadcasters and publishers (media buying). Increasingly they are also involved in related disciplines such as product placement and sponsorship. See Advertising Industry Structure for more on media agencies. The tables below are rankings for global media networks with billings estimated by COMvergence (* excluding Dentsu Japan). See Adbrands' individual country pages (for example the US or UK) for rankings of top media agencies in local markets.

Top Media Agencies by billings in 2020 from COMvergence


OMD is the lead network within Omnicom, working closely but not exclusively with the BBDO, DDB and TBWA ad agencies. It is arguably the most innovative global network, topping the rankings of awards for media planning and media buying every year since 2004.

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Mindshare is the biggest of the media networks within WPP, itself the world's biggest media planner and media buying group by billings. It was created originally from the combination of the inhouse media departments of WPP's JWT and Ogilvy & Mather advertising networks.

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Carat was for years the world's biggest media independent, with no direct ties to any of the major advertising networks. In 2012, it was acquired by Dentsu. Carat's strongest region is Europe. It is also the clear leader in Australia as a result of purchase of local unit Mitchell & Partners.

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MediaCom sits just behind WPP stablemate Mindshare. Originally formed from the media department of Grey advertising, it is especially strong in Europe, and the two key markets of the UK and Germany. In the UK, it is still the only agency ever to have topped £1.5bn in annual billings.

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MEC Global was the simplified brand adopted in 2010 by the WPP agency previously known as MediaEdge:CIA. In 2017, following the loss of its biggest US account, AT&T, WPP announced plans to merge MEC with smaller sister Maxus under the new name Wavemaker.

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Starcom MediaVest

Starcom MediaVest was the world's biggest media agency in 2015 because of its dominant position in the US. The loss of several key clients caused parent Publicis to split off Mediavest and several of its clients and merge them into much smaller Spark, leaving Starcom as the main agency

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Starcom MediaVest

Publicis-owned Spark Foundry was created from the spin-off of the old Mediavest brand and its remaining clients into smaller unit Spark. The Mediavest brand was later dropped. The resulting business is positioned as a challenger network. It absorbed sister agency Blue 449 in 2019.

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ZenithOptimedia was the other major media network within Publicis until 2016. Like Starcom MediaVest, it was split in two, and Optimedia was merged into smaller network Blue 449. When it was created in the 1980s Zenith arguably set the template for the modern media buying agency.

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Universal McCann

UM is the bigger of the two main media networks owned by Interpublic, and changed its name from Universal McCann to loosen ties to the main McCann advertising network. Recent performance has been overshadowed by the loss of several important clients.

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Havas Media

Havas Media, known until 2013 as MPG, is the main network of French group Havas. Its global footprint is patchy despite a dominant presence in France, Spain and much of Latin America. In 2017, Havas Group merged its creative and media networks under a single management team.

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Omnicom's second media network has evolved since 2001 from a single office in the UK into a major worldwide network. It has enjoyed especially strong growth since 2010 as a result of a series of spectacular account wins, both in the US and worldwide.

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Initiative Media

Like its Interpublic stablemate, Initiative suffered a series of major account losses in the early 2000s, although performance has stablised more recently. Even so it remains the smallest of what was until recently the "big ten" global media planning and media buying networks.

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dentsu x

Dentsu x is the third major media network within Dentsu Aegis Network, absorbing the Japanese group's existing international media operations from before the Aegis purchase. It operates mainly in Asia, though there is a growing presence in the US and Europe.

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Vizeum is the secondary media network created by parent Aegis, initially to resolve client conflicts within lead agency Carat. It evolved into a major force in its own right, especially in several European markets but is now being merged into sister agency iProspect.

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Hearts & Science

Hearts & Science was created by Omnicom in 2016 to manage the Procter & Gamble account in North America. Other clients followed, including another giant, AT&T. At the core of H&S's offering is an immensely sophisticated data analytics service.

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Digital media agency Essence was upgraded in 2019 into a fully fledged global network, replacing Maxus as WPP's #4 media network. Its tech-centred data-focused approach is being rolled out to the group's other networks by former CEO Christian Juhl, now overall head of WPP's GroupM media division.

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PlatformGSK is a dedicated unit within Publicis Media, formed in 2019 to handle the global media account of pharmaceutical and consumer healthcare giant GlaxoSmithKline.

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Arena is the second-string network within Havas, managing regional conflict accounts and a few key international clients. It is increasingly being absorbed into bigger sibling Havas Media.

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Other Agencies:
Horizon Media

Operating solely in the US, privately owned Horizon Media is that country's last major independent media planning and buying agency, bigger even than the local offices of several global networks. It relies on a small portfolio of loyal and high-spending clients. 

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Assembly is the main media arm of MDC Partners, formed from the merger in 2014 of acquired agencies RJ Palmer and TargetCast. It partners the group's various creative shops such as CP&B, KBS&P, Anomaly and 72andSunny.

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Naked Communications

Naked was a pioneer in "media neutral" planning when it originally launched, and it established a global network focused on media strategy. Life has proved more challenging since it was acquired by Australian group Enero prompting a move into creative services as well.

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Empower MediaMarketing

Another of the last remaining media independents in the US, in recent years Empower has evolved from a pure-play media agency into a more diversified business which also offers a broad range of creative services, especially in the digital sector.

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Top 18 in 2020 ranked by estimated billings from COMvergence * figures exclude Dentsu Japan

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